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Il~ee* <br />~~ UJ~oming Fuel Com~en~ <br />• INTEROFFICE CORRESPONDENCE <br />ro: <br />FROM: Mike Kolin October 16, 1987 <br />IN RE: Steve MdyRUSOR .S~ <br />New Elk Refuse Area Compaction Testing <br />Compaction testing in the New Elk Mine prep plant refuse area was <br />done on September 30, 1987 by Lincoln-DeVore Geotechnical <br />Consultants. The testing was done to determine the degree of <br />compaction which could be achieved using equipment available at <br />the mines along with determining the compaction which is being <br />achieved with our current methods of laying the refuse material <br />down. Sheets 1 and 2 show the locations of the tests and give a <br />description of any preparation which was done to the test areas. <br />The most critical item in achieving the proper compaction appears <br />to be the moisture content. All of the tests done on the <br />material with less than 148 moisture content had a dry density <br />over 908 even in the test areas which were not on a prepared <br />compacted pad. This would seem to indicate that the 980 loader <br />is providiny adequate compaction during normal load-haul-dump <br />operations. <br />I recommend that we continue to use the current operating <br />• methods ,_ as outlined on the following paye, with some minor <br />changes. Compaction testing should be done at least quarterly, <br />or more often as deemed necessary by WFC's inspector. <br />In the event that testing shows we are not achieving proper <br />compaction or the consistency of the refuse material changes, <br />these methods should be reviewed. <br />SM/sb/15 <br />CC: G. Weston <br />H. Elkin <br />T. Augustine <br />D. <br />s~ Killpack <br />• <br />